/*
Copyright 2019 The Fission Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package canaryconfig

import (
	"fmt"
	"time"

	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"

	fv1 "github.com/fission/fission/pkg/apis/core/v1"
	"github.com/fission/fission/pkg/fission-cli/cliwrapper/cli"
	"github.com/fission/fission/pkg/fission-cli/cmd"
	flagkey "github.com/fission/fission/pkg/fission-cli/flag/key"
)

type UpdateSubCommand struct {
	cmd.CommandActioner
	canary *fv1.CanaryConfig
}

func Update(input cli.Input) error {
	return (&UpdateSubCommand{}).do(input)
}

func (opts *UpdateSubCommand) do(input cli.Input) error {
	err := opts.complete(input)
	if err != nil {
		return err
	}
	return opts.run(input)
}

func (opts *UpdateSubCommand) complete(input cli.Input) (err error) {
	// get the current config
	_, ns, err := opts.GetResourceNamespace(input, flagkey.NamespaceCanary)
	if err != nil {
		return fmt.Errorf("error updating canary config: %w", err)
	}
	incrementStep := input.Int(flagkey.CanaryWeightIncrement)
	failureThreshold := input.Int(flagkey.CanaryFailureThreshold)
	incrementInterval := input.String(flagkey.CanaryIncrementInterval)

	// check for time parsing
	_, err = time.ParseDuration(incrementInterval)
	if err != nil {
		return fmt.Errorf("error parsing time duration: %w", err)
	}

	canaryCfg, err := opts.Client().FissionClientSet.CoreV1().CanaryConfigs(ns).Get(input.Context(), input.String(flagkey.CanaryName), metav1.GetOptions{})
	if err != nil {
		return fmt.Errorf("error getting canary config: %w", err)
	}

	var updateNeeded bool

	if incrementStep != canaryCfg.Spec.WeightIncrement {
		canaryCfg.Spec.WeightIncrement = incrementStep
	}

	if failureThreshold != canaryCfg.Spec.FailureThreshold {
		canaryCfg.Spec.FailureThreshold = failureThreshold
	}

	if incrementInterval != canaryCfg.Spec.WeightIncrementDuration {
		canaryCfg.Spec.WeightIncrementDuration = incrementInterval
	}

	if updateNeeded {
		canaryCfg.Status.Status = fv1.CanaryConfigStatusPending
	}

	opts.canary = canaryCfg

	return nil
}

func (opts *UpdateSubCommand) run(input cli.Input) error {
	_, err := opts.Client().FissionClientSet.CoreV1().CanaryConfigs(opts.canary.ObjectMeta.Namespace).Update(input.Context(), opts.canary, metav1.UpdateOptions{})
	if err != nil {
		return fmt.Errorf("error updating canary config: %w", err)
	}
	fmt.Printf("canary config '%v' updated\n", opts.canary.ObjectMeta.Name)
	return nil
}
